arrive是不及物动词,接宾语需要加介词at,in.在疑问句中,放在句尾时,加不加介词取决于两个因素.一是arrive 后加不加宾语.二是疑问词是代词还是副词,代词就加,副词不必加.
如：which city do you want to arrive at?which 是疑问代词,在句子里做arrive at 的宾语,介词不能省略.
另 when are you going to arrive?arrive后没有宾语,不需要介词
where do you want to arrive?where是副词省略介词